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1、理雜志ChineseJournalofPathophysiology20()至絲·2245·[文章編號]1000—4718(2013)12—2245—062型登革病毒誘導(dǎo)RAW264.7細胞凋亡的機制及凋亡對病毒復(fù)制的影響木張林,黃俊琪(中山大學(xué)中山醫(yī)學(xué)院免疫學(xué)研究所,教育部熱帶病防治研究重點實驗室,廣東廣州510080)[摘要】目的:探討2型登革病毒(DENV2)感染能否誘導(dǎo)RAW264.7細胞凋亡,并初步探討凋亡對病毒復(fù)制的影響。方法:用DENV2感染RAW264.7細胞,MTF檢測細胞活性,Hoechst33
2、342染色檢測細胞核變化,An-nexinV.FITC/PI雙染流式細胞術(shù)檢測細胞凋亡,Westernblotting檢測caspase一3和caspase一8活化片段的變化,比色法檢測caspase.9活性變化,JC.1染色檢測線粒體膜電位變化,Z—VAD—FMK抑制細胞凋亡后以TCID。檢測感染細胞上清病毒滴度。結(jié)果:DENV2感染RAW264.7細胞24h、36h及48h后細胞活性受到抑制,免疫熒光檢測有核固縮現(xiàn)象,流式細胞術(shù)檢測發(fā)現(xiàn)病毒感染誘導(dǎo)了細胞凋亡,Westernblotting檢測發(fā)現(xiàn)活化caspa
3、se一3和caspase一8的表達增加,caspase-9活性也增加,JC.1染色發(fā)現(xiàn)病毒感染誘導(dǎo)RAW264.7細胞線粒體膜電位降低,用Z—VAD—FMK抑制凋亡后感染細胞上清病毒滴度增加。結(jié)論:登革病毒感染可以通過內(nèi)、外源性途徑誘導(dǎo)RAW264.7細胞發(fā)生凋亡;凋亡發(fā)生抑制了病毒的產(chǎn)生。[關(guān)鍵詞]登革病毒;細胞凋亡;RAW264.7細胞[中圖分類號]R373.33[文獻標志碼】Adoi:10.3969/j.issn.1000—4718.2013.12.021Denguevirustype2inducesapop
4、tosisofRAW264.7cellsandefectofapoptosisonvirusreplicationZHANGLin,HUANGJun.qi(InstituteofImmunology,ZhongshanSchoolofMedicine,SunYet—senUniversity,KeyLaboratoryofTropicalDiseaseCon-trol,MinistryofEducation,Guangzhou510080,China.E—mail:huangiq@mail.sysu.edu.ca)
5、[ABSTRACT]AIM:Toexploretheapoptoticpathwayindenguevirustype2(DENV2)一infectedRAW264.7ceilsandtoanalyzetheeffectofapoptosisonvirusreplication.METHODS:RAW264.7cellswereinfectedwithDENV2.MTFassaywasusedtodetectthecellviability.ApoptosiswasassessedbyHoechst33342sta
6、iningandAnnexinV-FITC/PIstaining.Theexpressionlevelsofcaspase一3andcaspase-8weredeterminedbyWesternblotting.Theactivityofcaspase-9wasmeasuredwithacolorimetrickit.MitochondrialmembranepotentialwasevaluatedusingJC.1fluorescentstaining.TCID50wasusedtoestimatethein
7、fectiousvirionconcentrationafterusingZ—VAD—FMKtoinhibitapoptosis.RESULTS:TheviabilityofRAW264.7cellsdecreasedafterDENV2infectionat24h。36hand48h.Karyopyknosisindenguevirus.infectedceilswasobserved.Theproteinlevelsofcaspase一3andcaspase-8andtheactivityofcaspase一9
8、increasedintheap—optoticcellsafterdenguevirusinfection.Mitochondrialmembranepotentialwasreducedafterdenguevirusinfection.ThereWasahighervirionconcentrationinthecellcuhuremediumafte